/luy"leuhk, -lahk, -lak/ , n.
1. any of various shrubs belonging to the genus Syringa, of the olive family, as S. vulgaris, having large clusters of fragrant purple or white flowers: the state flower of New Hampshire.
2. pale reddish purple.
adj.
3. having the color lilac.
[ 1615-25; lilak
nil blue, indigo ( nila ) + -ak suffix of appurtenance ]